The P90 wis designed bi FN in conjunction wi the FN Five-seven pistol an 5.7×28mm ammunition.[2] Development o the P90 began in 1986, an production commenced in 1990, whaurupon the 5.7×28mm ammunition wis redesigned an shortened.[4] A modifee'd version o the P90 wi a magazine adaptit tae uise the new ammunition wis introduced in 1993, an the Five-seiven pistol wis subsequently introduced as a companion weapon uisin the same 5.7×28mm ammunition.[5]

The P90 is currently in service wi military an polis forces in ower 40 kintras throughoot the warld.[7] In the Unitit States, the P90 is in uise wi ower 200 law enforcement agencies, includin the U.S. Secret Service.[8] The staundart P90 is restrictit tae military an law enforcement customers, but syne 2005, a semi-automatic carbine version haes been affered tae civeelian shooters as the PS90.[9]